16640500254 has 80 divisors (see below), whose sum is σ = 39729921792. Its totient is φ = 4643687664.

The previous prime is 16640500249. The next prime is 16640500267. The reversal of 16640500254 is 45200504661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 606027 + ... + 632889.

Almost surely, 2^16640500254 is an apocalyptic number.

16640500254 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16640500254, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19864960896).

16640500254 is an abundant number, since it is smaller than the sum of its proper divisors (23089421538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16640500254 is an equidigital number, since it uses as much as digits as its factorization.

16640500254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26939 (or 26918 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The spelling of 16640500254 in words is "sixteen billion, six hundred forty million, five hundred thousand, two hundred fifty-four".